diff --git a/src/ARKServerManager/Globalization/en-US/en-US.xaml b/src/ARKServerManager/Globalization/en-US/en-US.xaml
index 0b9d7d4b..41f0a832 100644
--- a/src/ARKServerManager/Globalization/en-US/en-US.xaml
+++ b/src/ARKServerManager/Globalization/en-US/en-US.xaml
@@ -319,6 +319,7 @@
     <sys:String x:Key="WorldSaveRestore_Refresh_FailedTitle">Refresh Backup Files Error</sys:String>
 
     <sys:String x:Key="WorldSaveRestore_NameColumnLabel">Name</sys:String>
+    <sys:String x:Key="WorldSaveRestore_FileSizeColumnLabel">Size</sys:String>
     <sys:String x:Key="WorldSaveRestore_CreatedDateColumnLabel">Created</sys:String>
     <sys:String x:Key="WorldSaveRestore_UpdatedDateColumnLabel">Last Updated</sys:String>
 
diff --git a/src/ARKServerManager/Windows/WorldSaveRestoreWindow.xaml b/src/ARKServerManager/Windows/WorldSaveRestoreWindow.xaml
index fe28e951..7f591631 100644
--- a/src/ARKServerManager/Windows/WorldSaveRestoreWindow.xaml
+++ b/src/ARKServerManager/Windows/WorldSaveRestoreWindow.xaml
@@ -2,6 +2,7 @@
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:com="clr-namespace:ServerManagerTool.Common;assembly=ServerManager.Common"
+        xmlns:cc="clr-namespace:ServerManagerTool.Common.Converters;assembly=ServerManager.Common"
         MinWidth="700" MinHeight="480" Width="800" Height="480" ResizeMode="CanResize" WindowStyle="ToolWindow" WindowStartupLocation="CenterOwner" ShowInTaskbar="False" 
         Loaded="Window_Loaded"
         Icon="../Art/favicon.ico" Title="{DynamicResource WorldSaveRestore_Title}">
@@ -55,6 +56,18 @@
 
             <DataGrid.Columns>
                 <DataGridTextColumn     Width="1*" Binding="{Binding FileName, Mode=OneWay}" Header="{DynamicResource WorldSaveRestore_NameColumnLabel}"/>
+                <DataGridTextColumn     Width="130" Binding="{Binding FileSize, Mode=OneWay, Converter={cc:FileSizeConverter}}" Header="{DynamicResource WorldSaveRestore_FileSizeColumnLabel}">
+                    <DataGridTextColumn.HeaderStyle>
+                        <Style TargetType="DataGridColumnHeader" BasedOn="{StaticResource {x:Type DataGridColumnHeader}}">
+                            <Setter Property="HorizontalContentAlignment" Value="Right"/>
+                        </Style>
+                    </DataGridTextColumn.HeaderStyle>
+                    <DataGridTextColumn.CellStyle>
+                        <Style TargetType="DataGridCell" BasedOn="{StaticResource {x:Type DataGridCell}}">
+                            <Setter Property="HorizontalAlignment" Value="Right"/>
+                        </Style>
+                    </DataGridTextColumn.CellStyle>
+                </DataGridTextColumn>
                 <DataGridTextColumn     Width="130" Binding="{Binding CreatedDate, Mode=OneWay}" Header="{DynamicResource WorldSaveRestore_CreatedDateColumnLabel}">
                     <DataGridTextColumn.HeaderStyle>
                         <Style TargetType="DataGridColumnHeader" BasedOn="{StaticResource {x:Type DataGridColumnHeader}}">
diff --git a/src/ARKServerManager/Windows/WorldSaveRestoreWindow.xaml.cs b/src/ARKServerManager/Windows/WorldSaveRestoreWindow.xaml.cs
index 61df4870..80aab8eb 100644
--- a/src/ARKServerManager/Windows/WorldSaveRestoreWindow.xaml.cs
+++ b/src/ARKServerManager/Windows/WorldSaveRestoreWindow.xaml.cs
@@ -38,6 +38,7 @@ namespace ServerManagerTool
             public static readonly DependencyProperty CreatedDateProperty = DependencyProperty.Register(nameof(CreatedDate), typeof(DateTime), typeof(WorldSaveFile), new PropertyMetadata(DateTime.MinValue));
             public static readonly DependencyProperty FileProperty = DependencyProperty.Register(nameof(File), typeof(string), typeof(WorldSaveFile), new PropertyMetadata(string.Empty));
             public static readonly DependencyProperty FileNameProperty = DependencyProperty.Register(nameof(FileName), typeof(string), typeof(WorldSaveFile), new PropertyMetadata(string.Empty));
+            public static readonly DependencyProperty FileSizeProperty = DependencyProperty.Register(nameof(FileSize), typeof(long), typeof(WorldSaveFile), new PropertyMetadata());
             public static readonly DependencyProperty UpdatedDateProperty = DependencyProperty.Register(nameof(UpdatedDate), typeof(DateTime), typeof(WorldSaveFile), new PropertyMetadata(DateTime.MinValue));
             public static readonly DependencyProperty IsActiveFileProperty = DependencyProperty.Register(nameof(IsActiveFile), typeof(bool), typeof(WorldSaveFile), new PropertyMetadata(false));
             public static readonly DependencyProperty IsArchiveFileProperty = DependencyProperty.Register(nameof(IsArchiveFile), typeof(bool), typeof(WorldSaveFile), new PropertyMetadata(false));
@@ -60,6 +61,12 @@ namespace ServerManagerTool
                 set { SetValue(FileNameProperty, value); }
             }
 
+            public long FileSize
+            {
+                get { return (long)GetValue(FileSizeProperty); }
+                set { SetValue(FileSizeProperty, value); }
+            }
+
             public DateTime UpdatedDate
             {
                 get { return (DateTime)GetValue(UpdatedDateProperty); }
@@ -273,7 +280,7 @@ namespace ServerManagerTool
                 var saveFiles = saveFolderInfo.GetFiles(searchPattern);
                 foreach (var file in saveFiles)
                 {
-                    WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName , FileName = file.Name, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = false, IsActiveFile = file.Name.Equals(mapFileName, StringComparison.OrdinalIgnoreCase) });
+                    WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName , FileName = file.Name, FileSize = file.Length, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = false, IsActiveFile = file.Name.Equals(mapFileName, StringComparison.OrdinalIgnoreCase) });
                 }
 
                 var backupFolder = ServerApp.GetServerBackupFolder(_profile);
@@ -285,7 +292,7 @@ namespace ServerManagerTool
                     var backupFiles = backupFolderInfo.GetFiles(searchPattern);
                     foreach (var file in backupFiles)
                     {
-                        WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName, FileName = file.Name, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = true, IsActiveFile = false });
+                        WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName, FileName = file.Name, FileSize = file.Length, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = true, IsActiveFile = false });
                     }
                 }
 
diff --git a/src/ConanServerManager/Globalization/en-US/en-US.xaml b/src/ConanServerManager/Globalization/en-US/en-US.xaml
index 68ac6876..4504a934 100644
--- a/src/ConanServerManager/Globalization/en-US/en-US.xaml
+++ b/src/ConanServerManager/Globalization/en-US/en-US.xaml
@@ -294,6 +294,7 @@
     <sys:String x:Key="WorldSaveRestore_Refresh_FailedTitle">Refresh Backup Files Error</sys:String>
 
     <sys:String x:Key="WorldSaveRestore_NameColumnLabel">Name</sys:String>
+    <sys:String x:Key="WorldSaveRestore_FileSizeColumnLabel">Size</sys:String>
     <sys:String x:Key="WorldSaveRestore_CreatedDateColumnLabel">Created</sys:String>
     <sys:String x:Key="WorldSaveRestore_UpdatedDateColumnLabel">Last Updated</sys:String>
 
diff --git a/src/ConanServerManager/Windows/MainWindow.xaml b/src/ConanServerManager/Windows/MainWindow.xaml
index f74a181d..e9fa49f5 100644
--- a/src/ConanServerManager/Windows/MainWindow.xaml
+++ b/src/ConanServerManager/Windows/MainWindow.xaml
@@ -43,6 +43,10 @@
                         </Style>
                     </DockPanel.Style>
 
+                    <Grid DockPanel.Dock="Top" Background="Red" Visibility="{Binding CommonConfig.SteamAPIKey, Converter={StaticResource InvertStringNullOrEmptyToVisibilityConverter}}">
+                        <TextBlock Text="{DynamicResource MainWindow_SteamWebApiKeyMissingLabel}" Margin="0,5,0,5" HorizontalAlignment="Center" Foreground="White"/>
+                    </Grid>
+
                     <Grid DockPanel.Dock="Left">
                         <Grid.RowDefinitions>
                             <RowDefinition/>
diff --git a/src/ConanServerManager/Windows/WorldSaveRestoreWindow.xaml b/src/ConanServerManager/Windows/WorldSaveRestoreWindow.xaml
index 4f6f9332..0abc7622 100644
--- a/src/ConanServerManager/Windows/WorldSaveRestoreWindow.xaml
+++ b/src/ConanServerManager/Windows/WorldSaveRestoreWindow.xaml
@@ -2,6 +2,7 @@
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:com="clr-namespace:ServerManagerTool.Common;assembly=ServerManager.Common"
+        xmlns:cc="clr-namespace:ServerManagerTool.Common.Converters;assembly=ServerManager.Common"
         MinWidth="700" MinHeight="480" Width="800" Height="480" ResizeMode="CanResize" WindowStyle="ToolWindow" WindowStartupLocation="CenterOwner" ShowInTaskbar="False" 
         Loaded="Window_Loaded" 
         Icon="../Art/favicon.ico" Title="{DynamicResource WorldSaveRestore_Title}">
@@ -56,6 +57,18 @@
 
             <DataGrid.Columns>
                 <DataGridTextColumn     Width="1*" Binding="{Binding FileName, Mode=OneWay}" Header="{DynamicResource WorldSaveRestore_NameColumnLabel}"/>
+                <DataGridTextColumn     Width="130" Binding="{Binding FileSize, Mode=OneWay, Converter={cc:FileSizeConverter}}" Header="{DynamicResource WorldSaveRestore_FileSizeColumnLabel}">
+                    <DataGridTextColumn.HeaderStyle>
+                        <Style TargetType="DataGridColumnHeader" BasedOn="{StaticResource {x:Type DataGridColumnHeader}}">
+                            <Setter Property="HorizontalContentAlignment" Value="Right"/>
+                        </Style>
+                    </DataGridTextColumn.HeaderStyle>
+                    <DataGridTextColumn.CellStyle>
+                        <Style TargetType="DataGridCell" BasedOn="{StaticResource {x:Type DataGridCell}}">
+                            <Setter Property="HorizontalAlignment" Value="Right"/>
+                        </Style>
+                    </DataGridTextColumn.CellStyle>
+                </DataGridTextColumn>
                 <DataGridTextColumn     Width="130" Binding="{Binding CreatedDate, Mode=OneWay}" Header="{DynamicResource WorldSaveRestore_CreatedDateColumnLabel}">
                     <DataGridTextColumn.HeaderStyle>
                         <Style TargetType="DataGridColumnHeader" BasedOn="{StaticResource {x:Type DataGridColumnHeader}}">
diff --git a/src/ConanServerManager/Windows/WorldSaveRestoreWindow.xaml.cs b/src/ConanServerManager/Windows/WorldSaveRestoreWindow.xaml.cs
index 045d2629..00cc0ae6 100644
--- a/src/ConanServerManager/Windows/WorldSaveRestoreWindow.xaml.cs
+++ b/src/ConanServerManager/Windows/WorldSaveRestoreWindow.xaml.cs
@@ -38,6 +38,7 @@ namespace ServerManagerTool
             public static readonly DependencyProperty CreatedDateProperty = DependencyProperty.Register(nameof(CreatedDate), typeof(DateTime), typeof(WorldSaveFile), new PropertyMetadata(DateTime.MinValue));
             public static readonly DependencyProperty FileProperty = DependencyProperty.Register(nameof(File), typeof(string), typeof(WorldSaveFile), new PropertyMetadata(string.Empty));
             public static readonly DependencyProperty FileNameProperty = DependencyProperty.Register(nameof(FileName), typeof(string), typeof(WorldSaveFile), new PropertyMetadata(string.Empty));
+            public static readonly DependencyProperty FileSizeProperty = DependencyProperty.Register(nameof(FileSize), typeof(long), typeof(WorldSaveFile), new PropertyMetadata());
             public static readonly DependencyProperty UpdatedDateProperty = DependencyProperty.Register(nameof(UpdatedDate), typeof(DateTime), typeof(WorldSaveFile), new PropertyMetadata(DateTime.MinValue));
             public static readonly DependencyProperty IsActiveFileProperty = DependencyProperty.Register(nameof(IsActiveFile), typeof(bool), typeof(WorldSaveFile), new PropertyMetadata(false));
             public static readonly DependencyProperty IsArchiveFileProperty = DependencyProperty.Register(nameof(IsArchiveFile), typeof(bool), typeof(WorldSaveFile), new PropertyMetadata(false));
@@ -60,6 +61,12 @@ namespace ServerManagerTool
                 set { SetValue(FileNameProperty, value); }
             }
 
+            public long FileSize
+            {
+                get { return (long)GetValue(FileSizeProperty); }
+                set { SetValue(FileSizeProperty, value); }
+            }
+
             public DateTime UpdatedDate
             {
                 get { return (DateTime)GetValue(UpdatedDateProperty); }
@@ -261,14 +268,14 @@ namespace ServerManagerTool
                 var saveFiles = saveFolderInfo.GetFiles(searchPattern);
                 foreach (var file in saveFiles)
                 {
-                    WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName, FileName = file.Name, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = false, IsActiveFile = file.Name.Equals(mapFileName, StringComparison.OrdinalIgnoreCase) });
+                    WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName, FileName = file.Name, FileSize = file.Length, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = false, IsActiveFile = file.Name.Equals(mapFileName, StringComparison.OrdinalIgnoreCase) });
                 }
 
                 searchPattern = $"{mapName}_backup_*{mapExtension}";
                 saveFiles = saveFolderInfo.GetFiles(searchPattern);
                 foreach (var file in saveFiles)
                 {
-                    WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName, FileName = file.Name, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = false, IsActiveFile = file.Name.Equals(mapFileName, StringComparison.OrdinalIgnoreCase) });
+                    WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName, FileName = file.Name, FileSize = file.Length, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = false, IsActiveFile = file.Name.Equals(mapFileName, StringComparison.OrdinalIgnoreCase) });
                 }
 
                 var backupFolder = ServerApp.GetServerBackupFolder(_profile);
@@ -280,7 +287,7 @@ namespace ServerManagerTool
                     var backupFiles = backupFolderInfo.GetFiles(searchPattern);
                     foreach (var file in backupFiles)
                     {
-                        WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName, FileName = file.Name, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = true, IsActiveFile = false });
+                        WorldSaveFiles.Add(new WorldSaveFile { File = file.FullName, FileName = file.Name, FileSize = file.Length, CreatedDate = file.CreationTime, UpdatedDate = file.LastWriteTime, IsArchiveFile = true, IsActiveFile = false });
                     }
                 }
 
diff --git a/src/ServerManager.Common/Converters/FileSizeConverter.cs b/src/ServerManager.Common/Converters/FileSizeConverter.cs
new file mode 100644
index 00000000..4648575d
--- /dev/null
+++ b/src/ServerManager.Common/Converters/FileSizeConverter.cs
@@ -0,0 +1,39 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+using System.Windows.Markup;
+
+namespace ServerManagerTool.Common.Converters
+{
+    public class FileSizeConverter : MarkupExtension, IValueConverter
+    {
+        private const decimal DIVISOR = 1024M;
+
+        // Load all suffixes in an array  
+        private static readonly string[] suffixes = { "Bytes", "KB", "MB", "GB", "TB", "PB" };
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var counter = 0;
+            var number = System.Convert.ToDecimal(value);
+
+            while (number / DIVISOR >= 1)
+            {
+                number /= DIVISOR;
+                counter++;
+            }
+
+            return string.Format("{0:n2} {1}", number, suffixes[counter]);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new InvalidOperationException("FileSizeConverter can only be used OneWay.");
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            return this;
+        }
+    }
+}
\ No newline at end of file